Ments



(No Model.) A A.B.FLAGH.

SGAFFOLD CLAMP. q No. 309,038; 1 Patented Dec. 9, 1884.

WITNESSES: INVENTOE:

/ -"W a, @IZLJK M g 0 I BY MAM/14,

' ATTORNEYS.

llhvrrnn SrA'rEs PATENT @FFMEA ARTHUR B. FLAGH, OF NEW YORK, N. Y.,ASSIGNOR, BY MEsNE AssIcn- MENTS, ro rHEREsA L. FLAOH, or sAME PLACE.

SCAFFOLD-GLAMR SPECIFICATION forming part of Letters Patent No. 309,038,dated December 9, 1884-.

Application filed July 18. 1884.

To aZZ whom it may concern.-

Be it known that I, ARTHUR B. FLAOH, of the city, county, and State ofNew York, have invented a new and improved ScaffoldGlamp,

5 of which the following is a full, clear, and

exact description.

The object of my invention is to provide a new and improved clamp foruniting and holding together the posts and beams used in erectingscaffolding for building or other purposes.

The invention consists in a U-shaped bar having hooks 'formed 011 thefree ends, and pegs or studs on the inner surface of its crosspiece. Thesaid cross-piece has its inner surface convexed transversely, and has alongitudinal rib on its outer surface.

Reference is to be had to the accompanying drawings, forming part ofthis specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure l is an elevation of part of a scaffolding constructed with myimproved clamp.

Fig. 2 is an enlarged sectional plan view of the same on the line 00,Fig. 1. Fig. 3 is a sectional plan view on the line zz, Fig. 1. Fig. 4is a sectional plan view on the line yy, Fig. 1. Fig. 5 is an enlargedcross-sectional View on the line 0 c, Fig. 4.

A U-shaped metal bar, A, having hooks B on the ends, has its cross-pieceA made convex transversely on the inner side, and from the said convexsurface one or more rows of pegs, prongs, or studs, D, project. Alongitudinal strengthening rib, A, is formed on the outer surface of thecrosspiece of the clamp-bar A. The hooks B either project laterally fromthe ends of the prongs and are then in the plane of the bar, or theypro- 0 ject from the plane of the bar. If two posts, a Z), are to beheld together by means of the clamp, the ends of the posts areoverlapped, as shown in Fig. 1, and two or more U-shaped bars A areplaced against the overlapping part of each post, the hooks being at theinner sides of the posts. The hooks B of the bars A of each pair are atright angles to each other, and the corresponding hooks of each pair ofbars are interlocked or engaged 50 as shown. The upper pole, Z1, slidesdown un- (No model.)

der the action of its own weight, thereby in clining the clamps, asshown, thus forcing the pegs or studs D into the poles and giving theclamp an absolutely firm grip. In case ledgers F are to be supported, abar, G, is used, which has large hook-prongs H on the ends of theshanks, and which has an outwardlyprojecting prong J, at the inner partof each shank. The bar G is also provided with the pegs or studs D onthe cross-piece, and hooks H. It is placed against the upright beam insuch a manner that the pegged or studded side of the-cross-piece restsagainst the pole, and the hook-prongs Hproject from that side of thepole against which the ledger rests, the outer end of the said ledgerresting upon the said prongs H.

To hold the bar G in place, a bar, A, is used, the hooks B of which arepassed under the prongs J, the cross-pieces of' the bars G and A beingon opposite sides of the upright beam, as shown in Fig. 1.

The advantages of my improved clamps are that they are much stronger,safer, and cheaper than ropes; the scaffolding can be adjusted, 7erected, or taken down more readily,- they are not influenced byweather, and they prevent the poles from slipping or turning.

If desired, the U-shapcd pieces may be provided with a joint at themiddle, as shown at R in Fig. 2. By providing this joint the clamp canbe adapted for posts of different thicknesses.

Having thus fully described my invention, I claim as new and desire tosecure by Letters 8 5 Patent- 1. A scaffold-clamp consisting of a U-shaped bar having hooks on the ends of its prongs, studs or pegs on theinner surface of its cross-piece, and a longitudinal rib on the 0 outersurface of its cross-piece, substantially as herein shown and described.7

2. A scaffold clamp consisting of a U- shaped bar having hooks on theends of its prongs, and provided with a cross-piece the 5 inner surfaceof which is conveXed transversely, and provided with pegs or studs,substantially as herein shown and described.

3. A U-shaped bar, G, having hook-prongs H at the free ends and prongs Jat the inner part,- substantially as herein shown and prongs, and pegsor studs on the inner edge 10 described. of its cross-piece, which baris hinged in the 4. The combination, with a U-shaped bar, cr0ss-piece,substantially as herein shown and A, having hooks 0n the free ends, of aU- described.

5 shaped bar, G, having hook-prongs H on the free ends and prongs J atthe inner part, ARTHUR FLASH substantially as herein shown anddescribed. Witnesses:

5. A scaffold clamp consisting of a U- OSCAR F. GUNZ, shaped bar havinghooks on the ends of its 0. SEDGWIOK.

